Two more query-speeding indexes - add a node index by node_id,phys_nodeid to help keepalive stuff. Unfortuantely, this one doesn't seem to be making much of a difference.
Two more query-speeding indexes - add a node index by
node_id,phys_nodeid to help keepalive stuff. Unfortuantely, this
one doesn't seem to be making much of a difference.

Also, add a pid,eid key to resrved to ehlp queries that want to
find nodes assigned to a certain project, for example.

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome